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using System;
using System.IO;
using System.Net;
using System.Threading;
using System.Xml;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAPI;

namespace CFUValidator.Updates
{
    class AlternativeUrlDownloadUpdatesXmlSourceAction : DownloadUpdatesXmlAction, ICheckForUpdatesXMLSource
    {
        private readonly string newLocation;

        public AlternativeUrlDownloadUpdatesXmlSourceAction(string url)
            : base(true, true, true, "CFU", "1", url)
        {
            newLocation = url;
            ErrorRaised = null;
        }

        protected override XmlDocument FetchCheckForUpdatesXml(string location)
        {
            XmlDocument xdoc;
            using (Stream xmlstream = GetXmlDoc())
            {
                xdoc = Helpers.LoadXmlDocument(xmlstream);
            }
            return xdoc;
        }

        private Stream GetXmlDoc()
        {
            try
            {
                WebRequest wr = WebRequest.Create(newLocation);
                return wr.GetResponse().GetResponseStream();
            }
            catch (Exception)
            {
                ErrorRaised = new CFUValidationException("Failed to wget the URL: " + newLocation);
                throw ErrorRaised;
            }
        }

        public Exception ErrorRaised { get; private set; }

    }
}
